Department of Electronics & Telecommunications (IET) Norwegian University of Science & Technology (NTNU) NO-7491 Trondheim, NORWAY Phone:+47 735 94409 Mobile:+47 918 97658 E-mail: helge.weman (at) iet.ntnu.no Office: B415 "Elektro-blokken", Check map

My research focuses on synthesis and characterization of semiconducting quantum structures for use in energy efficient light emitters and solar cells. Since 2006 a strong focus is being made on heterostructured III-V semiconductor nanowires grown by molecular beam epitaxy. Fabrication of nanowire devices is being explored by electron beam lithography, nanoimprint and focused ion beam techniques. Opto-electronic characterization of e.g. nanowire quantum dots using techniques such as low temperature photocurrent and electroluminescence is done in order to understand and utilize quantum size effects for future photonic and photovoltaic device applications. During 2010-2013 I am leading a Nordic Consortium on III-V nanowire based solar cells entitled NANORDSUN.

NEWS!
Nov. 6, 2012. Our paper "A Story Told by a Single Nanowire: Optical Properties of Wurtzite GaAs" is accepted for publication in Nano Letters.

Sept. 10, 2012. NTNU makes a press release related to our publication in Nano Letters (below) and start-up company CrayoNano.

Aug 13, 2012. Our paper "Vertically Aligned GaAs Nanowires on Graphite and Few-Layer Graphene: Generic Model and Epitaxial Growth" is accepted for publication in Nano Letters.

June 27, 2012. I co-found CrayoNano AS who will develop a new hybrid material with unique properties. This is obtained by growing semiconductor nanowires on graphene. See how this is done in this animated YouTube video (more than 66 000 views)

April 2012. An article entitled "Always the sun: A new ray of sunshine" discussing the establishment, development, and future outlooks of  NANORDSUN was published in the April 2012 issue of the magazine "International Innovation".